my hdd is dead and i gave it for servicing. till then i want to install windows 7 or xp to usb pendrive and run usb as hdd. plz tell me how to do that. its urgent asss its the matter of my dads office work.my mb is m5a97 rs.0 and proc is amd fx8120
You cannot run any Windows version from any type of external drive because Windows Setup won't install on to those devices. In most cases, external USB storage devices won't even be visible to Windows Setup.
Sending your hard drive for servicing isn't wise. You should simply replace it with a new one.